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            <h2 class="text-4xl font-bold text-white">REEC Model</h2>
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          <h1 class="text-2xl font-bold text-gray-800 mb-2">REEC Model</h1>
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            The Regional Energy Economy Carbon model ( REEC ) is a dynamic, multi-regional Ramsey model based on neoclassical endogenous economic growth theory . Inheriting the basic framework of the Integrated Assessment Model ( IAM ) for Global Climate Change, REEC consists of three dynamically interacting modules: energy, economy, and environment . Based on input-output table data, the model uses 2007 as the base year and covers a 50 - year planning period from 2007 to 2057. Following official customary regional divisions, REEC divides China into eight regions : Beijing-Tianjin, North China, Central China, Northwest China, East China, Southwest China, South China, and Northeast China . Each region is interconnected through shared commodity flows (value) , energy imports and exports, and carbon trading . REEC assumes a forward-looking society with perfect foresight . Its goal is to maximize the intertemporal welfare of society as a whole by optimizing regional investment and consumption flows .
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						From a temporal perspective, the model is capable of describing the dynamic interactions among the economy, energy, and emissions over multiple periods. From a geographical perspective, it depicts the economic development and energy system reconstruction across multiple regions under the constraints of nationally unified and regionally differentiated climate targets. A key feature of the model is its development of a regional carbon emissions trading mechanism, which comprehensively considers population principles, income neutrality principles, hybrid principles, and auctions to allocate emission quotas between regions, enabling interregional emission permit trading. REEC is a valuable attempt to localize a global multi-regional integrated assessment model that integrates economic, energy, and environmental systems . It is suitable for studying the long-term evolution of energy technologies under regional carbon trading mechanisms, as well as the differentiated impacts of carbon pricing policies on the macroeconomy, investment, and consumption under emission constraints. The model has been applied to analyze the long-term development path of China's energy technologies under market - based mechanisms such as carbon taxes and emissions trading (ETS) .
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            <p class="text-sm text-gray-600 mt-2 text-center">Fig. 1 E3METL model framework</p>
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            The REEC model exemplifies the coupling of top-down and bottom - up modeling approaches, simultaneously accounting for multiple energy technology successions and multi-factor endogenous technological progress. A multi-regional version has been developed and applied to research on the long-term impact of carbon taxes and emissions trading schemes ( ETS ) on China's energy technology development, as well as the impact assessment of optimal policy choices on China's carbon peak and other nationally determined contributions. Related findings have been published in leading energy economics journals such as The Energy Journal and Energy Economics . In particular, a comprehensive assessment model for the energy-economy-environmental complex system encompassing all 31 provincial - level administrative regions in mainland China and multiple sectors, including construction, transportation, industry, and power, is under development.
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            <p class="text-sm text-gray-600 mt-2 text-center">Fig. 2 Impacts of E3METL Model</p>
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